SU399387A1 - In P T B - Google Patents

Description

one

This invention relates to forging and pressing machinery.

A screw press is known that contains a slide-mounted drive mounted in the bed guides, as well as pneumatic return cylinders.

The purpose of the present invention is to increase the efficiency of the press and the expansion of its technological capabilities.

For this purpose, the press is equipped with a drive beam for fastening the pneumatic cylinders, while the drive of the beam is made in the form of a pneumatic-hydraulic multiplier connected to the cylinders, the arms of which are connected to the beam. The drawing shows the proposed screw press.

The screw press contains stationary hydraulic cylinders 1, pneumatic cylinders 2 rigidly connected to the plunger hubs, fixed hydraulic cylinders 1. The plungers of the hydraulic cylinders 1 are interconnected by a cross-member 3 with a pusher fixed on it 4. The pneumatic cylinders are controlled by a spool 5. The high-pressure fluid generator is fed into the hydraulic cylinders 1, serves as a pneumatic-hydraulic multiplier 6, controlled by a spool 7. The upward movement is controlled by limit switches 8, 9, 10.

Screw press works as follows.

After the working stroke, the slider presses the cam of the limit switch 9, which turns on the spool 7. The compressed air enters the low-pressure cavity of the multiplier 6,

the pressure in the hydraulic circuit 1 rises to the maximum, the dies open and the forging is ejected. The force is transmitted from the plunger to the pneumatic cylinders 2 and to the yoke 3 with the ejector 4. From the pneumatic cylinders 2, the force is transmitted through the pistons and rods to the slider. The first ethane of the upward movement is required, which requires a significant stroke. After lifting the traverse 3 on

a certain height is triggered by the limit switch 10. which gives the command to actuate the spool 5. Air enters the cavity under the cylinders of the cylinders 2. After the die is pushed and the parts are pushed out, the force drops to the minimum, and to further raise the slider to the extreme upper position, the force developed by the pneumatic cylinders is sufficient 2. When approaching the highest position

a limit switch 8 is activated and a command is issued to shut off the spool 7. The low pressure cavity of the multiplier 6 is connected to the atmosphere. The limit switch 8 also gives a command to activate the brake (not shown) and. the slider stops. Under the action of the force developed by compressed air in the pneumatic cylinders 2, the cylinders begin to move downward, and the force is transmitted to the plungers of the hydraulic cylinders 1, which, displacing the liquid into the multinlicator, return to their original position.

In the lowest position of the yoke 3, it presses the limit switch 10, a command is issued to switch the spool 5. Air enters the rod cavities of the cylinder cylinders 2, and the pistons return to their original position. The press is ready for the next working stroke.

Prevention and Consideration

A screw press containing a slider with a drive mounted in the guide beds, as well as pneumatic return cylinders, characterized in that, in order to increase the efficiency of the press operation and expand its technological capabilities, it is equipped with a drive beam to secure the pneumatic cylinders, This drive traverse is made in the form of a pneumatic-hydraulic multiplier connected to cylinders, the piston rods of which are connected to the traverse.